LAS VEGAS — Tom Wilson has been at the center of controversy for hits he has delivered while playing for the Capitals this season.

On Tuesday night in Las Vegas, Wilson was on the receiving end of a crunching, blindside hit from the Golden Knights’ Ryan Reaves that injured Wilson when the Capitals winger hit his head on the ice.

While the Capitals weren’t thrilled with seeing one of their own having to be helped off the ice and down the tunnel, there was more frustration over not knowing what the NHL considers a legal hit these days. The NHL’s Department of Player Safety goes out of its way to explain why a hit is considered illegal when it hands down supplemental discipline to a player, but many of the Capitals said they are unclear about what the league wants when it comes to hits.